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Looks like a useful resource for quick Cisco configuration and troubleshooting help. Practical videos on VLANs, routing, and common issues would be especially helpful.
Yes, you can increase the RAM to 16 GB with the UCCX VM powered off. Just make sure the VM meets Cisco's supported UCCX 15.x specs and apply the same configuration to both HA nodes.
On Cisco 9800, permit in a Redirect ACL means the traffic will be redirected, while deny means the traffic is excluded from redirection and passes normally.
The CLI template is likely the intended way to configure GRE keepalives on IOS XE SD-WAN. The documentation appears to cover the capability, but the GUI may not expose the setting directly. Since it works through the CLI template, I’d stick with that...
